254 BYZANTINE CHURCHES CHAP. there it would not be near the cistern of Aspar, Mr. Siderides replies by denying the correctness of the Identification of that cistern with the open reservoir (Tchoukour Bostan) to the east of the gate of Adrianople, and in the vicinity of Kefel6 Mesjedi. In Mr. Siderides' opinion the cistern of Aspar is the beautiful covered cistern, generally known as the cistern of Pulcheria, to the south-west of the mosque of Sultan Selim.1 But the dimensions of the cistern ascribed to the famous sister of Theodosius IL do not accord with the size of the cistern of- Aspar. The latter was ca very large cistern,7 ryv pejicrr^v fcwa-repvav* while the former is only m. 29.1 long by m. 18 wide, with a roof supported on four rows of seven columns3 — not a large cistern as works of that class went in Constantinople. But if the cistern of Aspar was not situated in the district now marked by the mosque of Sultan Selim, neither could the monastery of Manuel have been there. Mr. Siderides/ moreover identifies the monastery of Manuel with that of Manoueliou (roD MavowyXiov) which appears in the Proceedings ot the Synod held at Constantinople in 536 under Justinian-5 This, however, does not agree with the statement that the monastery of Manuel was originally the private residence of the well-known general of that name in the ninth century. Furthermore, it is always dangerous to assume that the same name could not belong to different buildings, especially when the name occurs at distant intervals in the history of the city. Many mistakes in the topography of Constantinople are due to this false method of identification. As a matter of fact, the monastery of Manuel near the cistern of Aspar was not the only House of that name in the capital of the East. Another monastery of Manuel stood beside the Golden Horn, In the Genoese quarter, between the gate of the Neorion (Bagtch6 Kapoussi) and the gate of Eugenius (Yali Kiosk Kapoussi). It had a pier, known as the pier of the venerable monastery of Manuel, a"/cd\a r?}?